Thalassa 

Thalassa closely orbits Neptune once in 7 hours, 30 minutes and is very similar to many other moons of Neptune in its irregularity of shape and its general lack of geological activity. Thalassa orbits the same direction of Neptune and is close to its equatorial plane. The satellite is at a distance of 25,200 kilometers (15,700 miles) from Neptune's surface and as discovered in 1989 through analyzing photographs taken by Voyager 2.

Physical Data Key Mass Mass Mass Mass compared to that of Earth. Radius Radius Radius Radius compared to that of Earth. Mean Density Average Density. Distance Distance to the planet's center. Magnitude The brightness of a star or object.

Orbital Data Key Rotational Period Number of days to make one complete rotation. Orbital Period Number of days to obital the planet. Mean Orbital Velocity Average obital speed. Orbital Eccentricity Eccentricity. Orbital Inclination The tilt of the moon or planet. Escape Escape Velocity. Albedo Visual geometric albedo.